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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        let arr =[5,8,9,2,1,5]
        let sum = 0;
        for(i=0;i<arr.length;i++){
            const a = arr[i]
            sum=a+sum
        }
        alert(sum)
    </script>
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